JPS5822448Y2 - Air pumping circulation type air valve - Google Patents

Description

[Detailed description of the invention] This invention is a valve that is installed in the middle of a fluid pipeline such as a water main and used to remove air mixed in the pipeline.
That is, the present invention relates to an air valve, and more particularly, to an air valve having a function of automatically replacing the flow of fluid stagnant within a valve box.

Conventionally, air valves installed in pipelines are as shown in Figure 1.
The structure specified in JIS-B-2063 water supply air valve (single port) is used.

Here, A is the valve box, the mouth is the float valve, C is the float valve guide, 2 is the upper cover, E is the conical valve seat, 6 is the valve seat holder, and 1 is the screw top. Chi is a vent, and ri is a cock.

This is installed above the main pipe using a T-shaped pipe or a plug-in pipe.

In addition, this conventional air valve has a structure in which the fluid inlet/outlet passage connecting the inside of the air valve and the main pipe is a single opening hole, and the diameter of the single opening hole is small. , ■
When the main pipe line is full of water and no air is mixed in, the air valve will not be affected by the flowing water in the main pipe, and the water stored in the air valve box will be completely stopped. When air is mixed into the flowing water in the pipe line (conventionally, in this case, it was expected that the water stagnant in the valve box would be replaced.

), mixed air tries to be introduced into the air valve, but due to the competitive phenomenon between the air bubbles and the stagnant water, the air bubbles are not introduced smoothly into the valve box, and the stagnant water in the air valve box ends up in a water-stop state. .

The latter case (■), that is, the case where air is mixed in the flowing water in the main pipe, will now be considered in more detail.

The air in the flowing water in the main pipe flows as bubbles along the upper wall of the main pipe, and when it reaches just below the air valve, it tries to be introduced into the air valve, but the air bubbles flow along the upper wall of the main pipe, and when it reaches the air valve, it tries to be introduced into the air valve. Since the tube has a single opening, when air passes through the tube, the air cannot rise unless water by the volume of the air falls.

For this reason, the air rises and the water falls at the same time, and at this time, interfacial contact resistance between the air bubbles and the water occurs, making it difficult to smoothly introduce the air into the valve box I.

Even if air is introduced into the air valve, bubbles may be introduced from time to time until the introduced air is exhausted by joining and separating the float valve port and the conical valve seat E within the air valve box A. This expands the exclusive area and lowers the water surface from the upper part of the valve box.

At this time, the water stored in the valve box is pushed out to the pipe communicating with the main pipe, but when exhaustion is completed, the water stored in the air valve box is immediately returned to the air valve box.

In addition, the amount of air required to lower the water level in the valve box to allow the float valve port and the conical valve seat to connect and separate is small, so the water stored in the valve box remains essentially and remains inside the main pipe. It cannot be replaced with water.

In this way, with conventional air valves, the water inside the air valve box becomes static, and the rust on the inner wall of the valve box causes the water to appear red and cloudy. The air becomes suspended solids and causes problems in the intake and exhaust operation of the air valve.

Further, rust is trapped on the joint surface between the conical valve seat and the float valve, causing water leakage on the valve seat and causing a water leakage accident.

Furthermore, in water supplies, chlorine is added to sterilize bacteria and algae, etc., but after the residual chlorine contained in the tap water is consumed and disappears inside the air valve box, the water enters a state of suspended animation. Certain types of bacteria and algae that had been in the area will come back to life and provide a suitable place for their growth, which is also undesirable from a sanitary standpoint.

Therefore, in order to eliminate the above-mentioned drawbacks of conventional air valves, the air valve of the present invention actively uses the action of air bubbles to prevent the fluid inside the valve box when air is mixed in drift ice. The technical challenge is to replace the flow without stagnation.

The air valve of the present invention has the following configuration (technical means) in order to solve the above technical problem.

■In air valves that are installed with the opening at the bottom of the valve box communicating with the communication hole in the branch pipe section of the main pipe, ■The float valve guide is disposed within the valve box with a predetermined gap between it and the inner surface of the valve box. In addition to forming a drainage chamber, the outside has a substantially closed structure with a water inlet at the bottom and a water outlet at the top; A drainage hole with a predetermined gap is present in the communication hole of the valve, and is interposed between the inside of the valve box and the main pipe. The lower opening is arranged in communication with the main pipe opening of the branch pipe section.

This configuration provides the following effects.

That is, air bubbles mixed in the fluid flowing from upstream to downstream in the main pipe move along the earthen wall in the main pipe, and are captured by the lower opening of the water pump in the branch pipe.

The trapped air bubbles rise up the water pumping hole of the water pumping cylinder together with the water in the water pumping hole due to their buoyancy.

Air bubbles are directed into the valve chamber of the float valve guide through the water inlet at the bottom of the float valve guide.

The water in the valve chamber of the float valve guide is pushed up by the introduction of air bubbles and is discharged from the water outlet of the float valve guide into the drain chamber.

The water discharged into the drain chamber is pushed downward and discharged into the pipe through the drain hole as air bubbles rise inside the pumping hole and the water in the valve chamber is discharged through the water outlet. be done.

Therefore, when air bubbles rise in the pumping hole, the water in the valve chamber does not descend inside the pumping hole, but is discharged from the water outlet into the drain chamber, allowing air to be smoothly introduced from the main pipe to the valve chamber in the valve box. It will be held on.

In addition, the air bubbles remain in the upper part of the valve chamber and are exhausted by the same operation as a conventional air valve.

Due to this action, the water flowing from upstream in the main pipe is introduced into the valve box of the air valve at the same time as the air, and the water inside the valve box is discharged from a separate passage, automatically replacing the water.
In addition, since air is smoothly introduced into the valve box, the water remaining in the valve box does not become water-stopped.

The air valve of the present invention has the following unique effects.

■ The water in the valve box is replaced by fluid flow due to the pumping effect of air bubbles, so there are no mechanical parts and the mechanism is simple.

■ Since the flow of water in the valve box is replaced only when air bubbles flow in, the float valve does not move unnecessarily, there is less collision between the float valve and the valve seat, and there is no burden on the valve seat.

The present invention adopts the following embodiments.

■ Install an air bubble scattering device at the pumping hole of the pumping tube.

According to this aspect, the air bubbles introduced into the water pumping cylinder are diffused by the scattering tool and become small particles, so that the interfacial contact resistance between the surface of the air bubbles and the water increases, and the pumping efficiency of the fluid is further increased.

■ The opening at the top of the water pumping cylinder should widen toward the top.

With this aspect, the rising speed of the bubbles and water rising inside the water pumping cylinder is reduced at the upper opening, and the bubbles and water are separated.

Hereinafter, embodiments of the present invention will be described based on the drawings.

FIG. 2 is a longitudinal sectional view of one embodiment, and A is its air valve.

A float valve guide 15 is fixed to the inside of the valve box 14 of the air valve A by an upper cover 21, and a conical valve seat 18 for sucking and exhausting air is fixed to the upper cover 21 via a valve seat retainer 20.
Air ventilation holes 19 are formed.

The float valve 1 is located in the valve chamber 10 inside the float valve guide 15.
The float valve guide 15 is formed with a water inlet 9 through which water flows and a water outlet 16 through which water is discharged.

The water pump 6 is inserted into a pipe that communicates with the T-shaped branch pipe section 22 and the valve box 14 of the air valve, and the water pump 6 is clamped and fixed between the branch pipe flange 11 and the air valve flange 12.

A lower opening 4 that expands toward the main pipe is formed at the lower part of the water pumping tube 6 to collect air bubbles mixed in the flowing water flowing in the main pipe 1, and a water pumping hole 7 is formed at the upper part of the lower opening 4. A scattering device 5 for scattering air bubbles is fixed to the lower opening side entrance of the water pumping hole 7.

In addition, an upper opening (dissipation hole) 8 is formed on the air valve side of the water pumping tube and expands toward the top to reduce the velocity of the pumped water.

The float valve guide 15 and the water pumping cylinder 6 are the float valve guide 1
The peripheral edge of the water inlet 9 of No. 5 is connected to the upper opening 8 side of the water pumping tube 6.

The gap formed by the inner surface of the valve box 14 and the outer surface of the float valve guide 15 is a drainage chamber 13 from which water in the valve chamber 10 is drained, and the gap formed by the inner surface of the T-shaped branch pipe section 22 and the water pumping tube 6 The gap formed by the outer surface of the pipe is a drainage hole 23 through which the discharged water is introduced into the main pipe.

The operation of this embodiment will be explained.

Pass through the inlet side flange 2 of the main pipe 1 and the outlet side flange 3
In the water flowing into the water, air bubbles mixed into the water from the main pipe before the water inlet flange 2 pass through the water inlet flange 2 while flowing along the upper part of the pipe, and due to the buoyancy of the air bubbles, the air bubbles are mixed into the water from the main pipe before the water inlet flange 2. It gathers at the opening 4.

The collected air bubbles rise due to buoyancy, but collide with the scattering device 5 at the entrance of the water pumping hole 7, and the air bubbles are diffused and pass through the water pumping hole 7 in the form of small particles.

At this time, the water in the main pipe is pumped up due to the interfacial contact resistance between the bubble surface and the water.

Note that when the total volume of the bubbles is the same, the greater the number of bubbles, the greater the total area of the bubble surfaces, which increases the interfacial contact resistance and improves the fluid pumping efficiency.

The air bubbles that have passed upward while pumping water are introduced into the upper opening 8 to reduce the rising speed when rising through the pumping hole 7, the water and air bubbles are decelerated, and the bubbles rise due to buoyancy and rise through the pumping hole. , 7, the separation of air bubbles and water is performed at a slower speed than that in .

Then, while being separated, it passes through the water inlet 9 formed in the float valve guide 15 and is introduced into the valve chamber 10.

The bubbles introduced into the valve chamber 10 deform and pass through the gap formed between the float valve guide 15 and the float valve 17, and enter the valve chamber 1.
0 remains on the upper lid 21 side of the upper part, and is discharged to the outside air through the ventilation hole 19 in the same manner as a conventional air valve.

Furthermore, the fluid introduced into the valve chamber 10 passes through the gap formed between the float valve guide 15 and the float valve 17, passes through the water outlet 16 formed in the float valve guide 15, and flows through the valve box 14 and the float. The valve guide 15 is introduced into the drainage chamber 13 formed by the valve guide 15 .

The fluid introduced into the drain chamber 13 passes through the drain hole 23 and is discharged into the main pipe.

At this time, due to the eddy current generated by the shielding of the protrusion 24 at one end of the peripheral edge of the lower opening 4 formed in the water pumping tube 6, the water is mixed and stirred with the flowing water in the main pipe, which is not pumped and circulated, and flows to the water outlet flange 3.

Such a circulation operation is performed by water mixed with air bubbles flowing from the water inlet side.

Further, when the pressure of the fluid in the valve chamber 10 is lower than the outside air, air is sucked in by the same operation as a conventional air valve.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of a conventional air valve for water supply, and FIG. 2 is a vertical cross-sectional view of an embodiment of the air valve of the present invention. 1...Main pipe, 4...Lower opening, 6.
...Pumping tube, 7...Pumping hole, 8...
...Top opening, 9...Water inlet, 13...
...Drain room, 14... Valve box, 15...
Float valve guide, 16... Water outlet, 22...
... Branch pipe section, 23 ... Drain hole.

Claims (1)

[Scope of utility model registration request] 1. In an air valve that is installed with the opening at the bottom of the valve box 14 communicating with the communication hole of the branch pipe section 22 of the main pipe 1, the float valve guide 15 has a predetermined gap with the inner surface of the valve box in the valve box 14. are arranged to form a drainage chamber 13, and
The water pumping tube 6 has a water inlet 9 at the bottom and a water outlet 16 at the top, and has a substantially closed structure on the outside. A drain hole 23 with a predetermined gap is provided in the drain hole 23 and is interposed between the inside of the valve box 14 and the main pipe 1. An air pumping and circulation type air valve, characterized in that it is attached in communication with a water inlet 9, and the lower opening 4 is arranged toward the main pipe opening of the branch pipe section 22. 2. The air valve according to claim 1, wherein the water pumping hole 7 of the water pumping tube 6 is provided with a bubble scattering device 5. 3. The air valve according to claim 1 or 2, wherein the upper opening 8 of the water pumping cylinder 6 is enlarged toward the upper part.